/** Proofs GPU - Space and Time's cryptographic proof algorithms on the CPU and GPU.
 *
 * Copyright 2023-present Space and Time Labs, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once

#include <concepts>
#include <type_traits>
#include <utility>

#include "sxt/multiexp/base/exponent_sequence.h"

namespace sxt::mtxb {
//--------------------------------------------------------------------------------------------------
// to_exponent_sequence
//--------------------------------------------------------------------------------------------------
template <class Cont, class T = std::remove_cvref_t<decltype(*std::declval<const Cont>().data())>>
exponent_sequence to_exponent_sequence(const Cont& cont) noexcept
  requires requires {
    { cont.data() } -> std::convertible_to<const T*>;
    { cont.size() } -> std::convertible_to<uint64_t>;
  }
{
  static_assert(sizeof(T) <= 32, "element is too large");
  const T* data = cont.data();
  int is_signed = 0;
  if constexpr (std::is_signed_v<T>) {
    is_signed = 1;
  }
  return exponent_sequence{
      .element_nbytes = sizeof(T),
      .n = cont.size(),
      .data = reinterpret_cast<const uint8_t*>(data),
      .is_signed = is_signed,
  };
}
} // namespace sxt::mtxb
